Procrastination, for me at least (and the spouse says he's the same) comes out of fear of failure. It's not just accepting that the first draft/pass/attempt at anything will be sucky, it's the fear that when I reach a point where I'm doing well on a project, it becomes harder and harder and harder to keep working on it, because surely (says Fear-Of-Failure Brain) I can't keep up this level of quality.
So I keep telling myself, it's okay if page one sucks. It's also okay if page one is awesome but page ten sucks. It's okay if page one through ten is good, page eleven is okay, but page twelve is bleh... and so on. And it's really fucking hard.
Butt in Chair helps. To-do tools like Habitica help (at least for me). Brain trickery helps -- I'll promise yourself I'll work on the task for five minutes, and then give it five solid minutes. Five minutes is better than nothing, and more often than not, inertia will take over, and I'll work for far longer than five minutes.
Mainly, it's all about persistence and embracing the fact that it's okay to suck.